2021 Decathlon RockRider ST 120
- Category
- Hardtail Cross-country MTB
- Design
- Flat Bar, Hardtail (Front suspension)
- Frame
- Aluminum
- Suspension
- 80mm fork travel
- Features
- Disc brake
Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Somewhat upright stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry | Average stack and reachvs category Suspension sag unknown Geometry may mis-represent actual riding geometry |
Geometry
S | M | L | XL | |
Stack | 587mm | 606mm | 615mm | 634mm |
Reach | 378mm | 388mm | 429mm | 443mm |
Stack to Reach Ratio | 1.55:1 | 1.56:1 | 1.43:1 | 1.43:1 |
Seat Tube Length, Unknown | 361mm | 393mm | 417mm | 498mm |
Top Tube Length, Effective/Horizontal Unknown | 577mm | 595.6mm | 616.6mm | 636.3mm |
Top Tube Slope | 26.6deg | 24.6deg | 21.4deg | 15deg |
Head Tube Angle | 69.5deg | 69.5deg | 69.5deg | 69.5deg |
Seat Tube Angle | 73deg | 73deg | 73deg | 73deg |
Head Tube Length | 110mm | 130mm | 140mm | 160mm |
Bottom Bracket Drop | 43mm | 43mm | 43mm | 43mm |
Bottom Bracket Height | 299.8mm | 299.8mm | 299.8mm | 299.8mm |
Chainstay Length | 430mm | 430mm | 430mm | 430mm |
Chainstay Length Horizontal | 427.8mm | 427.8mm | 427.8mm | 427.8mm |
Front-Center | 627.6mm | 646.9mm | 688.5mm | 709.5mm |
Front-Center Horizontal | 626.2mm | 645.5mm | 687.2mm | 708.2mm |
Wheelbase | 1054mm | 1073.3mm | 1115mm | 1136mm |
Fork Offset/Rake | 40mm | 40mm | 40mm | 40mm |
Fork Length, Unknown | 474mm | 474mm | 474mm | 474mm |
Trail | 85.5mm very high | 85.5mm very high | 85.5mm very high | 85.5mm very high |
Mechanical Trail | 80.1mm | 80.1mm | 80.1mm | 80.1mm |
Wheel Flop | 28mm | 28mm | 28mm | 28mm |
Tire to Pedal Spindle | 114.8mm 170 mm cranks | 134.1mm 170 mm cranks | 175.7mm 170 mm cranks | 196.7mm 170 mm cranks |
Pedal Spindle to Ground Clearance | 129.8mm 170 mm cranks | 129.8mm 170 mm cranks | 129.8mm 170 mm cranks | 129.8mm 170 mm cranks |
ST 120 Build
S | M | L | XL | |
Wheel Size | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD | 650B/27.5 in 584 mm BSD |
Tire Width | 2in | 2in | 2in | 2in |
Tire Outer Diameter | 685.6mm | 685.6mm | 685.6mm | 685.6mm |
Bike Length with Tires | 1739.6mm | 1758.9mm | 1800.6mm | 1821.6mm |
Handlebar Width | 640mm | 640mm | 640mm | 640mm |
Stem Length | 90mm | 90mm | 90mm | 90mm |
Stem Angle | 10deg | 10deg | 10deg | 10deg |
Published Sizing Recommendations
Height | 150 cm to 164 cm | 165 cm to 174 cm | 175 cm to 184 cm | 185 cm to 200 cm |
Stack and Reach vs. Category Trend
Very Upright
Somewhat Upright
Average
Somewhat Aggressive
Very Aggressive
The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.
Learn more about the Upright/Aggressive ScaleCategory Trend
Hardtail Cross-country MTBSource:https://www.decathlon.it/p/mtb-rockrider-st-120-nero-azzurro-27-5/_/R-p-305496